Yes he did.
"He was boring before his turn to lunacy and worse after."
As a person, maybe. But his music, definitely not.
Truth is, even before 9/11, I never forgave Islam for taking Cat Stevens music away!
We have different musical tastes..I was never into folksy jazz op music...can’t dance to it! I fid it trite and boring. Preachy. Just like him. Catty is a creep.